{"nrhp_refnum":"06000782","name":"United States Post Office-Main Branch","other_names":[],"category":"building","location":{"address":"2970 Market St.","address_restricted":false,"city":"Philadelphia","county":"Philadelphia","state":"PA","lat":39.95591700400007,"lon":-75.18251425499994,"geom_source":"nps_gis"},"listed_date":"2006-09-05","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Politics/Government"],"significance_levels":["local"],"summary":{"what_it_is":"A six-story Art Deco limestone and granite steel-frame post office occupying a full city block at the southeast corner of Market and S. 30th Streets in Philadelphia, built 1931-1935. It served as the city's main postal center.","why_significant":"The nomination argues the building is significant under Criterion A for its role in Philadelphia's postal history and mail distribution, and under Criterion C as a prominent work of the architecture firms Rankin & Kellogg and Tilden, Register & Pepper. It describes the building as an outstanding example of the Art Deco style, with the Main Branch's period of significance covering its full construction and early use.","narrative":"Occupying an entire city block at the southeast corner of Market and 30th Streets in Philadelphia, this six-story steel-frame post office was designed in 1931 and completed in 1935 in the Art Deco style. Its limestone walls rest on a granite base and are organized into fluted piers, bronze-framed windows and stepped upper setbacks, with carved limestone panels on the north tower. The building was planned as part of the Philadelphia Improvements program, a transportation project linking the Pennsylvania Railroad with the city, and was intended to connect rail service with mail handling below ground. Rankin & Kellogg and Tilden, Register & Pepper were chosen as architects, and construction took four years amid labor disputes and strikes. Within its first year it handled about 1.25 million pieces of mail daily. It is regarded as an important center for mail and package distribution in Philadelphia and a prominent example of federal architecture from the 1930s.","period_of_significance":"1931-1955","architect_builder":"Rankin & Kellogg; Tilden, Register & Pepper; James A. Wetmore (supervising architect); Starrett Brothers & Eken (contractor)","architectural_style":"Art Deco","criteria":["A","C"],"status_note":"Owned by the University of Pennsylvania after a 2004 sale and planned for rehabilitation as offices; the USPS continues to lease part of the building for administrative offices.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:10:27.080873-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/06000782.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/06000782/169d91ec99-800.webp","url_1600":"https://nationalhistoricalregister.com/media/06000782/169d91ec99-1600.webp","licence":"Public domain","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Philly_Post_Office.JPG\" rel=\"noopener\">Smallbones</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Philly_Post_Office.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71997354","wikipedia":"https://en.wikipedia.org/wiki/United_States_Post_Office-Main_Branch_(Philadelphia)","wikidata":"https://www.wikidata.org/wiki/Q7890899"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/philadelphia/united-states-post-office-main-branch-06000782/"}